Dielectric Properties of Ferrite/Silicon Carbide/Graphite Three-layer Composite Coating Materials

Abstract

The flexible knitted polyester fabric was used as a base material and a three-layer composite coating was applied to the structure material by using ferrite,silicon carbide,and graphite absorbing materials,and the composites were prepared with different coating thickness.The influences of the thickness of the bottom layer,the middle layer,and the surface layer coating on permittivity's the real part,the imaginary part and loss tangent were discussed.The results show that the dielectric properties of the composite material are sound at low frequencies.The thickness of the coating has a clear influence on the permittivity's real part,the imaginary part and the loss tangent of the composite material.When the thickness of the bottom coating layer is 0.5mm,the thickness of the middle coating layer is 0.3mm,and the thickness of the surface coating layer is 0.3mm,the permittivity's real part,imaginary part,and loss tangent of the ferrite/silicon carbide/graphite coating composite material reaches the maximum value.

Keywords

• polyester
• ferrite
• silicon carbide
• graphite
• coating
• dielectric constant